vert "SLUB: remove useless masking of GFP_ZERO"

This reverts commit 3811dbf67162bd08412f1b0e02e554f353e93bdb.

The masking was not at all useless, and it was sensible.  We handle
GFP_ZERO in the caller, and passing it down to any page allocator logic
is buggy and wrong.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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